The UNFCCC 2030 Target for Public Finance Adaptation focuses on the public finance actors increasing provision of climate finance and allocating 50% of climate funds to adaptation and resilience. As an official decision at COP28, it was recommended that one of the actions and Means of Implementation be to support the Bridgetown Initiative as it was postulated that this is required to make the 2030 target a reality. Building sustainability and resilience to climate change in Barbados is currently being implemented through strategic initiatives such as the Bridgetown Initiative and the Roofs to Reefs Programme (R2RP). The R2RP serves as an umbrella programme for Barbados’ sustainable development projects in which the two Green Climate Funded (GCF) projects, Water Sector Resilience Nexus for Sustainability in Barbados (WSRN S-Barbados) and the R’s (Reduce, Reuse and Recycle) for Climate Resilience Wastewater Systems in Barbados (3R-CReWS), are nested. This SIDS4 side event aims to facilitate a discussion on the GCF’s various financing mechanisms and funding proposal types, and to provide two examples from Barbados on the Water-Energy-Food-Ecosystems (WEFE) Nexus and discusses the experiences of the Caribbean Community Climate Change Centre along the journey from concept note to implementation.